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Measurement and Instrumentation

Measurement and Instrumentation
The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240×10-6 N-m on full scale. If magnetic flux density is 1Wb/m2 range of meter is

 3 mA.
 1 mA.
 4 mA.
 2 mA.

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Measurement and Instrumentation
In induction type ammeter, _____ damping is provided.

None of the listed here
Fluid friction
Eaddy current
Air friction

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Measurement and Instrumentation
Which of the following meter is most suitable for measuring radio frequency currents?

  Thermocouple meter.
 Moving - coil meter.
 VTVM.
 Moving - iron meter.

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Measurement and Instrumentation
Deflection method direct measurements are most widely used as these are

 most simple and least time consuming.
 least time consuming.
 most simple.
 most accurate.

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Measurement and Instrumentation
In a wheatstone bridge, a change of 6 Ω in the unknown arm of bridge is required to produce a change in deflection of 2.4 mm of the galvanometer. The sensitivity is

 2.5 mm/Ω
 5.0 mm/Ω
 0.8 mm/Ω
 0.4 mm/Ω

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Measurement and Instrumentation
A moving iron instrument can be used for

Both DC& AC
DC only
None of the listed here
AC only

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